Process for the preparation of crystalline sodium disilicates

Details Process for the preparation of crystalline sodium disilicates Process for the preparation of crystalline sodium disilicates

C - Chemistry, Metallurgy

01

B

C01B 33/32 (2006.01) C01B 33/38 (2006.01)

Patent

CA 2085327

To prepare crystalline sodium disilicates having a laminar structure, a molar ratio of SiO2 to Na2O of (1.9 to 2.1): 1 and a water content of less than 0.3% by weight, a water glass solution is first obtained by reacting sand with sodium hydroxide solution in a molar ratio of SiO2 to Na2O of (2.0 to 2.3) : 1 at temperatures of 180 to 240°C and pressures of 10 to 30 bar. This water glass solution having at least 20% by weight of solids is treated in a spray drier with hot air at 200 to 300°C with the formation of a pulverulent amorphous sodium disilicate having a water content (determined as loss on heating at 700°C) of 15 to 23% by weight and a bulk density of at least 300 g/l. The spray-dried pulverulent, amorphous sodium disilicate is ground. The ground sodium disilicate is introduced into a rotary kiln equipped with devices for moving solids, externally heated via the wall and having in its interior a plurality of different temperature zones, and is treated therein at temperatures of 400 to 800°C for 1 to 60 minutes with formation of crystalline sodium disilicate.

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